The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/875cef2100560bcb9308e72742f7b5a00c2c66ab

commit 875cef2100560bcb9308e72742f7b5a00c2c66ab
Author: romax <romax@chromium.org>
Date: Fri Oct 21 01:26:29 2016

[Offline Page] Fix test failure on svelte devices.

The failure was because we weren't trying to run tests on low-end devices
and we weren't trying to do immediate scheduling on svelte devices. Adding
a call to the callback resolved the issue.

BUG= 657775 

Review-Url: https://chromiumcodereview.appspot.com/2433283003
Cr-Commit-Position: refs/heads/master@{#426676}

[modify] https://crrev.com/875cef2100560bcb9308e72742f7b5a00c2c66ab/components/offline_pages/background/request_coordinator.cc
[modify] https://crrev.com/875cef2100560bcb9308e72742f7b5a00c2c66ab/components/offline_pages/background/request_coordinator_unittest.cc

The test now succeeds, but we get (on this and a few other tests) error messages like:

I  266.062s run_tests_on_device(AG86044202EI2GC)  [ RUN      ] RequestCoordinatorTest.SavePageLater
I  266.062s run_tests_on_device(AG86044202EI2GC)  [ERROR:memory_mapped_file.cc(52)] Couldn't open /storage/sdcard0/chromium_tests_root/paks/content_shell.pak
I  266.062s run_tests_on_device(AG86044202EI2GC)  [ERROR:data_pack.cc(79)] Failed to mmap datapack
I  266.062s run_tests_on_device(AG86044202EI2GC)  [       OK ] RequestCoordinatorTest.SavePageLater (6 ms)
https://build.chromium.org/p/chromium.android/builders/Lollipop%20Low-end%20Tester/builds/4188/steps/components_unittests/logs/stdio

Is this expected?

Sorry for the late reply, but seems like you also have those error messages in the first post. I'm not sure why it's there and I believe I've seen it before. Even though not sure if it's 'expected'.
I'll ask around and get back later.

I think those errors are always there... and the test failure has been fixed. hence closing the bug. please feel free to reopen if it's more than showing error messages.